Overview

A fax (short for facsimile), is the transmission of scanned printed material (text or images) via voice grade telephone lines. High speed rates as high as 33.4 kbps (V.34 or Super Group 3) can be achieved over conventional telephone lines. When combined with compression schemes, many pages of print can be transmitted in minutes. When transmitted over regular telephone lines, a simple protocol called T.30 is used by both fax machines to negotiate transmission parameters and provide reliable transfer of scanned documents. Recently fax transmission is also possible over voice circuits that are packet based. This form of transmission usually demodulates the modulated signal back to the original scanned bits and then transmits them via packets to the distant end where they are remodulated to be sent to the destination fax machine.

GL has recently introduced single and bulk (100's) call Fax Simulator. This software is capable of transmitting and receiving over many T1 E1 timeslots or through two-wire FXO and FXS lines. The software can emulate many "virtual fax machines" - transmitter as well as receiver. All variations are supported.

Fax Simulator can be used with any GL Protocol Emulation tools such as MAPS™ CAS emulator, MAPS™ ISDN emulator, and MAPS™ SS7 emulator to simulate complete real time Fax calls.

GL also supports FaxScan™ (fax decoder/demodulator) software that processes 2-Wire or 4-Wire captures and analyzes voiceband traffic files for fax traffic. The application operates either stand-alone from a batch file or as part of the GL's VoiceBand Analysis application to produce decoded fax image TIFF files and other transmission information.

Load Testing - sending or receiving up to hundreds of faxes simultaneously; one end can send and receive simultaneously on different timeslots; over many T1 E1 lines; over many FXO or FXS lines; any signaling protocol can be used such as PRI ISDN, SS7, or CAS

V.34 Testing - there are many fax modulations and V.34 is the fastest, permitting many pages to be transmitted quickly.

Use of data signaling rate of 4800 bits per second with 8-phase differentially encoded modulation as described in Recommendation V.27.

Reduced rate capability at 2400 bits per second with 4-phase differentially encoded modulation as described in Recommendation V.26.

V.29

Fallback rates of 7200 and 4800 bits per second

Combined amplitude and phase modulation with synchronous mode of operation

Inclusion of an automatic adaptive equalizer

V.33

Fallback rate of 12000 bits per second

Combined amplitude and phase modulation with synchronous mode of operation

Inclusion of an eight state trellis coded modulation

V.34

half-duplex modes of operation are used for fax

Quadrature Amplitude Modulation (QAM) for each channel with synchronous line transmission at selectable symbol rates including the mandatory rates of 2400, 3000, and 3200 symbols/s and the optional rates of 2743, 2800 and
3429 symbols/s

Trellis coding for all data signaling rates

Adaptive techniques that enable the modem to achieve close to the maximum data signaling rate the channel can support on each connection

Exchange of rate sequences during start-up to establish the data signaling rate

Transmit Fax Session

The above command transmits a multi-page file named 'transmit.tif' into timeslot 1 of port #1, with Alaw codec, V.27 modem, min data rate 2400 bps, max data rate of 4800 bps, A4 page-size, resolution type 200x200 with ECM and record PCM option enabled to record the signals being exchanged during the FAX transmission to a PCM file.

If user wanted to transmit 30 such faxes of differing pages of images, then users can simply invoke many such commands simultaneously with the proper timeslot #. The fax can also be transmitted over multiple ports.

Receive Fax Session

The above command receives a fax on E1 Port 2 timeslot 1, and saves the tiff image as 'receive.tif' file with Alaw codec, modem V.27, min data rate 2400 bps, A4 page-size, resolution type 200x200 with ECM and record PCM option enabled to record the signals being exchanged during the FAX reception to a PCM file.

If user wanted to receive 30 such faxes of differing pages of images, then users can simply invoke many such commands simultaneously with the proper timeslot #. The fax can also be received over multiple ports.

This command will Receive the fax signal on port 2 timeslot 1 and save the image as RCV.tif.

Buyer's Guide:

Please Note: The XX in the Item No. refers to the hardware platform, listed at the bottom of the Buyer's Guide, which
the software will be running on. Therefore, XX can either be ETA or EEA (Octal/Quad Boards), PTA or PEA (tProbe Units),
UTA or UEA (USB Units), HUT or HUE (Universal Cards), and HDT or HDE (HD cards) depending upon the hardware.